I worked at a company for 11 months, started on the same day as a woman and we were in a training group together.
Got on well and helped each other out, messaged often. After a few months I was moved onto team 1 and her onto team 2, she was unhappy in the team and struggled.
We were in the same office so sometimes met at lunch and spoke pretty much daily on teams. She felt like she was being bullied by her manager and I gave her advice and support, and helped her apply for other jobs.
I got another job as I was unhappy working there and left 6 weeks ago. I had to drop my equipment off on the very last day, i told her and we said we could meet up.
I said to her "I'll be there for 10". Waited 10-15 minutes but no sign of her, but we'd already said we could meet for a coffee in town so I knew I'd see her again.
Got a message at 10:50 saying she was there. I explained I'd had to leave once I'd dropped off my equipment as wasn't allowed to stay in the building and I hadn't heard anything so I was really sorry I couldn't say bye there, but that we'd see each other for a,coffee. I even gave the following weekend as my availability for example, she replied 'no problems'.
That was 6 weeks ago, haven't seen her or heard from her. I messaged 4 weeks ago to ask how her new team was. She said 'amazing' then replied, I replied back and never got a reply.
AFAIK nothing happened, I think it's just out of sight out of mind, did I do something wrong here? Maybe by considering her an actual friend?